Method for making aromatic polyformals

摘要

A method is provided for making linear film forming aromatic polyformals having a reduced percent by weight of aromatic polyformals in the cyclic state. Reduced cyclic polyformal content in the linear aromatic polyformal is achieved by a filtration of the reaction product of a bisphenol and methylene halide in the presence of an alkali metal hydroxide, followed by the addition of an antisolvent to the reaction mixture to effect reverse precipitation.